Electrical cooking device.



F. E. CARLSON.-

. ELECTRICAL COOKING DEVICE.

APPLlCATlON FILED AUG.Y| I913. 1,137,050. Parented Apr. 27, 191:).

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ATTORNEY.

F. E. CARLSON.

ELECTRICAL COOKING DEVICE. APPLICATION FILED AueJ, 1913.

1 ,137,050. Patented Apr. 27, 1915.

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UNITED STATES PATENT OFFICE.

FREDERICK E. CARLSON, OF NEW BRITAIN, CONNECTICUT, ASSIGNOR T0,.LANDERS,

FRARY & CLARK, OF NEW BRITAIN, CONNECTICUT, A CORPORATION OF CON- NECTICUT.

' ELECTRICAL COOKING DEVICE.

Patented Apr. 27, 1915.

Application filed August 7, 1913 Serial No. 783,475.

To all whom it may concern Be it known that 1, FREDERICK E. CARL". son, a citizen of the United States, and'a resident of New Britain, in the county of Hartford, State of Connecticut, have invented certain new and useful Improvements in Electrical Cooking Devices, of which the following is a specification.

The invention relates particularly to an electrical oven, and is concerned with the general mechanical construction of the'body of the oven, with the construction of the electrical heater, and the manner of connecting it into circuit, and with additional features of construction which will be more particularly pointed out in the following specification. y

In the drawingsFigure 1 is a front view. of an oven embodyingmy invention,'Fig. 2 is a sectional view on the line 22 of Fig. 1, Fig. 3 is a plan viewof the electrical heater withpart of the cover plate broken away, Fig. 4 is a perspective view of the oven with a part of one side wall broken away, Fig. 5 is a detail view of the door construction, Fig. 6 is a sectional view on the line 6-6 of Fig. 5.

Referring first to the mechanical construe.-

' tion of the oven, the main body of the oven,

comprising the sides a, b, and the back, '0, is a double-walled structure formed from a single sheet of thin stock of proper width, which is folded about a form to the proper shape, the ends of the strip being united by an interlocking seam as at at. Sheets of asbestos e are laid against the inner faces of these walls, and then spacers f are inserted to prevent collapse. The top and bottom are formed by fitting within the walls of the body dished plates 9, it, having at their side and rear edges lateral flanges g,

72 arranged in .a plane slightly below the top of the body, constituting pockets 9", If, within which the top and bottom edges of the inner wall of the body fit, the edges of the flanges abuttingagainst the outer wall of the body. The ends of thesides a, b, and

the fronts of the dished plates 9, h," form the door opening in the front of'theioven. These dished plates are lined with sheet asbestos, and then receive spacersf' and are inclosed by cover plates 11,]0, the edges of which are bent down as indicated at i, k to cover over the joints betweenthe body occasion demands.

and the top and bottom. Corner plates Z finish the top, and the feet m, are located at the corners of the bottom. Tie rods 11. pass through the cover plate 1 the dished plates 9, h, the cover plate It, and the feet m, and have nuts threaded to their lower ends, by means of which the partsof the ,left exposed, making it possible to thoroughly cleanse the inside of the oven when The door comprises a frame r hinged to the end of one of the sides, b the frame comprises a'deeply channeled member s of rectangular form, having edge flanges, about which the edgesof a finished plate a are folded, forming a ledge about the inner margin of the, frame, on which the panel t ofsome transparent material, as glass, may besupported, held in place by the angle strips u which are secured by the clips 1; which engage the adjacent ends of two of the angle strips. It is desirable to hold the panel securely in place, and the clips engagethe angle strips rather than the material of thepanel. and so avoid damaging it. The door members of the hinges are formed integrally with the door structure by rolling over the knuckles s from the edge of the channeled member s.

The door construction is, of sheet metal and is very stiff, preventing sagging or war ing, and the knuckles formed integrally wit the frame make a very rigid hinge support. The

pivoted door latch w has a slotted end whichengages a headed pin w' secured in the end of the side walla, and the slotted end is twisted slightly to, have a camming action on the pin to. cause the-door to be tightly shut audits flanges to lie closely against the edges of the door opening to prevent the esca e. of heat from t e interior of the oven.

The structure thus far described has been made the subjectof a divisional application. An "important and desirable feature of this invention resides .in the rovi'sion of a receptor 1 which has a sliding fit in the oven, the base 2 of this receptor having upstandin side flanges 3 which will catch and retain rippings from anything which is beported the food which is to be cooked. Thus it will be seen that the receptor. not only supports the removable parts but also largely prevents the interior of the oven from becoming fouled, and may itself be removed for cleansing. I

Mounted in the inner wall of the back are the sockets 7 at which 'the electrical connection of the heater is made. receptor is in the oven and the heater. is to be used under the food, it slides in on the lowest pair of ribs, and as it is pushed into position the plugs 8 enter the lower socket and make electrical connection therewith. When the heater is to be used above the food, as in broiling, it slides in onv the upper pair of ribs and makes electrical connections with the upper socket. The heater ispreferably so wired as to produce three different heats, and the sockets-are connected up with a 3-way switch 20, mounted on a bracket 21,- and by means of which the circuit connections are established. A cover plate 22 having a slip connection with the bracket as at 23 is held in place by the screw 24 andconceals the wire connection of the sockets and attachment plug with the switch.

The heater is of rectangular shape and of a size to slide on the ribs in the receptor. As shown, it is composed of a wire frame about which are .wound the edges 31 of-lateral flanges32 extending from the sides of a shallow recessed base 33. 34 is a recessed cover plate slightly larger than the base plate "33 and secured thereto in any convenient manner. This plate is imperforate in order that when the heater is used under the food which is being cooked, any drippings or droppings will strike the cover plateand run off onto the flanges 32 of the base plate, Where it can drip down through the apertures 35 to the bottom of the receptor. This protects the interior of the heater from the accumulation of dirt, grease, etc., and avoids the possibility of shortcircuiting the resistance coil. When the heater is to be used above the food which is to be cooked, as in the case of broiling, it is turned upside down, and in place of the cover plate a wire netting is used, the base of the heater throwing the heat down onto the food.

Arranged around the edges of the recess in the base are metal strips 40 folded over a packing of electrical insulation 41, and the tops of these strips are transversely slotted at intervals as indicated at 42. Alternately short and long arms 43, 44, have their ends embedded in this insulating material where it is exposed by the slots, and have loops at their edges which support the resistance coils 45, 46. These coils are .so as to position it.

When the stretched slightly as they are seated in the loops and then the loops are pinched to hold them under tension.

Centrally arranged within the heater is an annular band 50 which acts as a spacer ,between the top and bottom of the heater, and also as a diffuser of the heat, and the top and bottom plates are slightly recessed These depressions in the base and cover of. the heater, as well as the offset in the base of the receptor, are also useful in determiningthe direction of move-- ment of these plates as they expand when heated, and prevent the snapping and consequent jarring of the oven which would otherwise be occasioned if the plates were fiat 'and free to buckle in either direction; This constitutes an important feature in the construction of the oven since the jarring of the structure which would otherwise be occasioned by the buckling and snapping of the plates interferes with the successful cooking or baking of various foods.

In the bottom of the heater apertures 51 are formed to permit of the circulation of air through and around theresistance coils. In the bottom plate It andnear the back of the oven, small apertures k are formed, which provide an outlet for the air in the bottom of the oven as it expands, furnishing a supply of heated air to the interior of the oven and facilitating its operation. One

end of the coil 45 is connected with the plug 7 w; the corresponding end' of the coil 46 is connected with the plug 3 and the opposite ends of both coils are connected with the plug 2.. The connection of these plugs, :10, 3 e, is controlled through the 3-Way switch 20, and the three heats are obtained first by connecting the coils in series, next by cutting out the coil 45, and next by connecting the coils up in parallel.

52 indicates a rack which may be of any desired construction suitable to slide in the receptor and support food which is to be cooked.

By this invention an oven of extreme simprovided, Well insulated to conserve the heat, and well protectedto insure its cleanliness. Novel means are provided for. connecting up the heater with the circuit, and the heater itself is thoroughly protected against damage. The complete structure constitutes a very efficient and serviceable oven, requiring a minimum amount of current in the production of quick results.

Patent No. 1,129,381, S. No. 827,099, filed March 25, 1914, is a division of the present application.

I claim as my inventions- 1. In an electric oven, supporting ribs at op posite sides, an electrical heater adapted to move longitudinally on said ribs for positioning within the oven, contact plugs later- 'plicity in and economy of construction is,

ally projecting from one edge of the heater, and sockets mounted in the back of the oven below the wall and open to the interior thereof, said plugs and sockets adapted to be alternately engaged and disengaged by the horizontal movement of said heater into and out of position within the oven.

' 2. In an electric oven, sockets mounted in the back thereof below the plane of the inner wall of the back, in alinement with apertures therein, a receptor snugly fitting within and removable from said oven, side walls on said receptor provided with supporting ribs, an electrical heater slidable on said ribs into and out of said oven, and plugs projecting laterally from the rear edge of said heater and adapted tobe alternately engaged with and disengaged from said sockets by the movement of the heater into and out of said oven.

3. The combination with an electric oven provided at its sides with oppositely projecting supporting ribs arranged in alined pairs at different elevations, of an electric heater comprising'a recessed base, lateral flanges, the edges of which are adapted to rest and slide upon said supporting ribs, an electrical resistance located within the recessed base, a cover plate overlying said recessed base and supported on said lateral flanges, said flanges being apertured beyond the edges of the cover plate.

4:. A heater adapted for use in electric ovens and similar devices, comprising a shallow recessed base adapted to be supported at its side edges on the sides of the oven, strips of insulating material arranged about the sides of the recessed base, arms embedded in said insulating material with their ends bent to form inwardly extending lateral supports, and an electrical resistance coil arranged about the sides of said base and secured to "said lateral supports.

5 A heater for use in electric ovens and similar devices comprising a shallow recessed base, an oppositely recessed cover plate secured thereto, an electrical resistance located around the sides of said base, and an annular ring arranged centrally of and extending between said base, and cover.

6. A heater for'use in electric ovens and like devices comprising a base, strips of electrical insulating material arranged about the sides'of said base, armsembedded in said insulating material and having their ends bent to form inwardly projecting supports, some of which are of greater length than others, a pair of electrical resistance coils, one of which is mounted on the longer supports and the other on the shorter sup-' ports, a cover plate for said base, and an annular rin located within the inner coil and contactlng at its edges with the base and cover plate. r

7. A heater for use'in electric ovens and similar devices, comprising a shallow recessed base, an oppositely recessed cover plate secured thereto, and an electrical resistance located within the base, said base and cover plate being centrally offset for the purposes set forth.- 8. An electrical oven comprising a hollow-walled body and a door closure therefor, an electrical heater located within said' body, circuit connections therefor, and a communicating passage between the interior of said body and one of its hollow walls.

9. An electrical oven comprising a hollow-walled body and a door closure therefor, an electrical heaterremovably located within said body, interengaging contact members on said body and heater.

FREDERICK E. CARLSON.

Witnesses WALTER M. PAYsoN, DAVID MonEEN. 

